Kath Alcock paintings: 2
Acacia from the Greek 'akakia' and derived from 'ake' or 'akis' meaning a sharp point or thorn and 'akazo' meaning to sharpen. Dioscorides, the Greek physician and botanist used the word in the 1st century AD for the Egyptian thorn tree, Acacia arabica. Erinacea from the Latin 'erinaceus' meaning prickly, referring to its prickly nature.
Distribution and status
A minor occurrence in the south-west corner of the Nullarbor region, found in open scrub vegetation in shallow calcareous loamy soils. Also occurs in Western Australia. Native. Rare in South Australia. Common in Western Australia.
Herbarium region: Nullarbor
NRM region: Alinytjara Wilurara
AVH map: SA distribution map (external link)
Small, rigid, spreading, intricate shrubs to 2 m high. Branches spine-tipped, whitish slightly angular-striate, glabrous, becoming grey-brown with young growth reddish. Leaves narrow to broadly obliquely lanceolate to 12 mm long and 4 mm wide, flat, thick, rigid, erect or spreading, grey-green or often with a whitish scurfy covering. Young leaves reddish-brown with a small gland on the upper margin below the centre of the leaves. Inflorescences simple and axillary, solitary with globular, yellow flower-heads. Flowering between September and October Fruits are brown, oblong pods to 3 cm long and 1 cm wide, flattish-obtuse but shortly pointed. Seeds are hard, dark brown to black, ovoid to sectoroid seed to 3 mm long and 3 mm wide. Seed embryo type is investing.
Seed collection and propagation
Collect seeds between November and January. Collect mature pods that are turning brown with hard, dark seeds inside. Place the pods in a tray and leave to dry for 1-2 weeks or until the pods begin to split. Then rub the dried pods to dislodge the seeds. Use a sieve to separate any unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. From one collection, the seed viability was high, at 85%. This species has physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).
|Location||No. of seeds|
|BGA||2,400 (25.83 g)||15||4-Nov-2009||MJT243|